Object Shapes is used for accessing instance variables and representing the
"frozenness" of objects. Object instances have a "shape" and the shape
represents some attributes of the object (currently which instance variables are
set and the "frozenness"). Shapes form a tree data structure, and when a new
instance variable is set on an object, that object "transitions" to a new shape
in the shape tree. Each shape has an ID that is used for caching. The shape
structure is independent of class, so objects of different types can have the
same shape.
For example:
```ruby
class Foo
def initialize
# Starts with shape id 0
@a = 1 # transitions to shape id 1
@b = 1 # transitions to shape id 2
end
end
class Bar
def initialize
# Starts with shape id 0
@a = 1 # transitions to shape id 1
@b = 1 # transitions to shape id 2
end
end
foo = Foo.new # `foo` has shape id 2
bar = Bar.new # `bar` has shape id 2
```
Both `foo` and `bar` instances have the same shape because they both set
instance variables of the same name in the same order.
This technique can help to improve inline cache hits as well as generate more
efficient machine code in JIT compilers.
This commit also adds some methods for debugging shapes on objects. See
`RubyVM::Shape` for more details.
For more context on Object Shapes, see [Feature: #18776]
Co-Authored-By: Aaron Patterson <tenderlove@ruby-lang.org>
Co-Authored-By: Eileen M. Uchitelle <eileencodes@gmail.com>
Co-Authored-By: John Hawthorn <john@hawthorn.email>
getenv is a very basic function that has been in stdlib.h since
ISO/IEC 9899:1990. There is absolutely zero need for us to redeclare.
pty.c already includes stdlib.h out of the box so we need nothing.
The reason why this was commented out was because of gperf 3.0 vs 3.1
differences (see [Feature #13883]). Five years passed, I am pretty
confident that we can drop support of old versions here.
Ditto for uniname2ctype_p(), onig_jis_property(), and zonetab().
Fixes id.h error during updating ripper.c by `make after-update`.
While it used to update id.h in the build directory, but was trying to
update ripper.c in the source directory. In principle, files in the
source directory can or should not depend on files in the build
directory.
icc now seems to provide libutil.so that is not related to pty.
This extconf.rb wrongly finds it and adds `-lutil`, but `ruby -rpty`
fails because it cannot find libutil.so on the runtime.
20220815T210005Z.fail.html.gz
```
Exception raised:
<#<LoadError: libutil.so: cannot open shared object file: No such file or directory - /home/chkbuild/chkbuild/tmp/build/20220815T210005Z/ruby/.ext/x86_64-linux/pty.so>>
```
This change makes extconf.rb check libutil only on OpenBSD.
As commented in include/ruby/internal/abi.h, since teeny versions of
Ruby should guarantee ABI compatibility, `RUBY_ABI_VERSION` has no role
in released versions of Ruby.
* Fix Array#[] with ArithmeticSequence with negative steps
Previously, Array#[] when called with an ArithmeticSequence
with a negative step did not handle all cases correctly,
especially cases involving infinite ranges, inverted ranges,
and/or exclusive ends.
Fixes [Bug #18247]
* Add Array#slice tests for ArithmeticSequence with negative step to test_array
Add tests of rb_arithmetic_sequence_beg_len_step C-API function.
* Fix ext/-test-/arith_seq/beg_len_step/depend
* Rename local variables
* Fix a variable name
Co-authored-by: Kenta Murata <3959+mrkn@users.noreply.github.com>
Adding `ruby` to `PREP` causes the following circular dependencies
because `PREP` is used as a prerequisite by some targets required to
build `ruby` target itself.
```
make: Circular .rbconfig.time <- ruby dependency dropped.
make: Circular builtin_binary.inc <- ruby dependency dropped.
make: Circular ext/extinit.c <- ruby dependency dropped.
make: Circular ruby <- ruby dependency dropped.
```
Adding a new Make variable like `EXTPREP` only for exts may be also
reasonable, but it would introduce another complexity into our build
system. `-bundle_loader` doesn't care that link-time and run-time
loader executables are different as long as bound symbols are provided,
so it's ok to resolve from miniruby to simplify our build.
For the macOS -bundle_loader linker option, we need a path to the
Ruby exectuable. $(RUBY) is not necessarily a path since it could
be a command line invocation. That happens during build with
runruby.rb and can happen post installation if the user passes
the --ruby option to a extconf.rb. Use $(bindir) to locate
the executable instead.
Before installation, $(bindir) doesn't exist, so we need to be
able to override $(BUILTRUBY) in such situations so test-spec
and bundled extensions could build. Use a new mkmf global,
$builtruby, to do this; set it in fake.rb and in extmk.rb.
Our build system is quite complex...
ld64 shipped with Xcode 14 emits a warning when using `-undefined
dynamic_lookup`.
```
ld: warning: -undefined dynamic_lookup may not work with chained fixups
```
Actually, `-undefined dynamic_lookup` doesn't work when:
1. Link a *shared library* with the option
2. Link it with a program that uses the chained-fixup introduced from
macOS 12 and iOS 15
because `-undefined dynamic_lookup` uses lazy-bindings and they won't be
bound while dyld fixes-up by traversing chained-fixup info.
However, we build exts as *bundles* and they are loaded only through
`dlopen`, so it's safe to use `-undefined dynamic_lookup` in theory.
So the warning produced by ld64 is false-positive, and it results
failure of option checking in configuration. Therefore, it would be an
option to ignore the warning during our configuration.
On the other hand, `-undefined dynamic_lookup` is already deprecated on
all darwin platforms except for macOS, so it's good time to get rid of
the option. ld64 also provides `-bundle_loader <executable>` option,
which allows to resolve symbols defined in the executable symtab while
linking. It behaves almost the same with `-undefined dynamic_lookup`,
but it makes the following changes:
1. Require that unresolved symbols among input objects must be defined
in the executable.
2. Lazy symbol binding will lookup only the symtab of the bundle loader
executable. (`-undefined dynamic_lookup` lookups all symtab as flat
namespace)
This patch adds `-bundle_loader $(RUBY)` when non-EXTSTATIC
configuration by assuming ruby executable can be linked before building
exts.
See "New Features" subsection under "Linking" section for chained fixup
https://developer.apple.com/documentation/xcode-release-notes/xcode-13-release-notes
Treats:
::httpdate
#to_date
#to_time
#to_datetime
In behalf of ::httpdate, I've introduced section "Argument limit" that can be pointed to by various Date methods (similar to existing section "Argument start"). This will involve 8 already-enhanced methods plus 8 more not yet done.
00326ff99c
Tabs were expanded because the file did not have any tab indentation in unedited lines.
Please update your editor config, and use misc/expand_tabs.rb in the pre-commit hook.
